[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-09-04 UTC."],[[["\u003cp\u003eThe latest release candidate version is 2.37.0-rc, and the page lists available documentation for versions ranging from 2.10.1 up to the latest candidate.\u003c/p\u003e\n"],["\u003cp\u003eThis document provides details on the \u003ccode\u003epromise<T>\u003c/code\u003e implementation, aligned with the ISO/IEC TS 19571:2016 standard.\u003c/p\u003e\n"],["\u003cp\u003e\u003ccode\u003epromise<T>\u003c/code\u003e objects can be created with or without a shared state, with options including a default constructor, a constructor with a cancellation callback, and one with \u003ccode\u003enull_promise_t\u003c/code\u003e.\u003c/p\u003e\n"],["\u003cp\u003eThe document includes operator overloads for \u003ccode\u003epromise\u003c/code\u003e objects, allowing for assignment and movement of shared states.\u003c/p\u003e\n"],["\u003cp\u003eKey functions for \u003ccode\u003epromise\u003c/code\u003e objects include \u003ccode\u003eswap()\u003c/code\u003e, \u003ccode\u003eget_future()\u003c/code\u003e, and \u003ccode\u003eset_value()\u003c/code\u003e, with \u003ccode\u003eset_value()\u003c/code\u003e having the potential to throw exceptions such as \u003ccode\u003estd::future_error\u003c/code\u003e if it is already satisfied or has no shared state.\u003c/p\u003e\n"]]],[],null,["# Class promise<T> (2.15.1)\n\nVersion 2.15.1keyboard_arrow_down\n\n- [2.42.0-rc (latest)](/cpp/docs/reference/common/latest/classgoogle_1_1cloud_1_1promise)\n- [2.41.0](/cpp/docs/reference/common/2.41.0/classgoogle_1_1cloud_1_1promise)\n- [2.40.0](/cpp/docs/reference/common/2.40.0/classgoogle_1_1cloud_1_1promise)\n- [2.39.0](/cpp/docs/reference/common/2.39.0/classgoogle_1_1cloud_1_1promise)\n- [2.38.0](/cpp/docs/reference/common/2.38.0/classgoogle_1_1cloud_1_1promise)\n- [2.37.0](/cpp/docs/reference/common/2.37.0/classgoogle_1_1cloud_1_1promise)\n- [2.36.0](/cpp/docs/reference/common/2.36.0/classgoogle_1_1cloud_1_1promise)\n- [2.35.0](/cpp/docs/reference/common/2.35.0/classgoogle_1_1cloud_1_1promise)\n- [2.34.0](/cpp/docs/reference/common/2.34.0/classgoogle_1_1cloud_1_1promise)\n- [2.33.0](/cpp/docs/reference/common/2.33.0/classgoogle_1_1cloud_1_1promise)\n- [2.32.0](/cpp/docs/reference/common/2.32.0/classgoogle_1_1cloud_1_1promise)\n- [2.31.0](/cpp/docs/reference/common/2.31.0/classgoogle_1_1cloud_1_1promise)\n- [2.30.0](/cpp/docs/reference/common/2.30.0/classgoogle_1_1cloud_1_1promise)\n- [2.29.0](/cpp/docs/reference/common/2.29.0/classgoogle_1_1cloud_1_1promise)\n- [2.28.0](/cpp/docs/reference/common/2.28.0/classgoogle_1_1cloud_1_1promise)\n- [2.27.0](/cpp/docs/reference/common/2.27.0/classgoogle_1_1cloud_1_1promise)\n- [2.26.0](/cpp/docs/reference/common/2.26.0/classgoogle_1_1cloud_1_1promise)\n- [2.25.1](/cpp/docs/reference/common/2.25.1/classgoogle_1_1cloud_1_1promise)\n- [2.24.0](/cpp/docs/reference/common/2.24.0/classgoogle_1_1cloud_1_1promise)\n- [2.23.0](/cpp/docs/reference/common/2.23.0/classgoogle_1_1cloud_1_1promise)\n- [2.22.1](/cpp/docs/reference/common/2.22.1/classgoogle_1_1cloud_1_1promise)\n- [2.21.0](/cpp/docs/reference/common/2.21.0/classgoogle_1_1cloud_1_1promise)\n- [2.20.0](/cpp/docs/reference/common/2.20.0/classgoogle_1_1cloud_1_1promise)\n- [2.19.0](/cpp/docs/reference/common/2.19.0/classgoogle_1_1cloud_1_1promise)\n- [2.18.0](/cpp/docs/reference/common/2.18.0/classgoogle_1_1cloud_1_1promise)\n- [2.17.0](/cpp/docs/reference/common/2.17.0/classgoogle_1_1cloud_1_1promise)\n- [2.16.0](/cpp/docs/reference/common/2.16.0/classgoogle_1_1cloud_1_1promise)\n- [2.15.1](/cpp/docs/reference/common/2.15.1/classgoogle_1_1cloud_1_1promise)\n- [2.14.0](/cpp/docs/reference/common/2.14.0/classgoogle_1_1cloud_1_1promise)\n- [2.13.0](/cpp/docs/reference/common/2.13.0/classgoogle_1_1cloud_1_1promise)\n- [2.12.0](/cpp/docs/reference/common/2.12.0/classgoogle_1_1cloud_1_1promise)\n- [2.11.0](/cpp/docs/reference/common/2.11.0/classgoogle_1_1cloud_1_1promise)\n- [2.10.1](/cpp/docs/reference/common/2.10.1/classgoogle_1_1cloud_1_1promise) \nImplement `promise\u003cT\u003e` as defined in ISO/IEC TS 19571:2016.\n\nConstructors\n------------\n\n### promise()\n\nCreates a promise with an unsatisfied shared state.\n\n### promise(std::function\\\u003c void()\\\u003e)\n\nCreates a promise with an unsatisfied shared state.\n\n### promise(null_promise_t)\n\nCreates a promise *without* a shared state.\n\n### promise(promise \\&\\&)\n\nConstructs a new promise and transfer any shared state from `rhs`.\n\n### promise(promise const \\&)\n\nOperators\n---------\n\n### operator=(promise \\&\\&)\n\nAbandons the shared state in `*this`, if any, and transfers the shared state from `rhs`.\n\n### operator=(promise const \\&)\n\nFunctions\n---------\n\n### swap(promise \\&)\n\nSwaps the shared state in `*this` with `rhs`.\n\n### get_future()\n\nCreates the `future\u003cT\u003e` using the same shared state as `*this`.\n\n### set_value(T)\n\nSatisfies the shared state."]]
